Ocean and Polar Research

Korea Institute of Ocean Science & Technology (한국해양과학기술원)
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Reproductive Condition of the Tropical Blacklip Pearl Oyster, Pinctada margaritifera (Linnaeus 1758) from Chuuk Lagoon, Federated State of Micronesia during the Summer Months in 2003

Chuuk Lagoon에 서식하는 흑진주조개, Pinctada margaritifera (Linnaeus 1758)의 2003년 하계 생식소 발달 및 산란 특성

  • Kang, Do-Hyung (School of Applied Marine Science, College of Ocean Science, Cheju National University) ;
  • Park, Heung-Sik (Marine Environment Research Department, KORDI) ;
  • Yi, Soon-Kil (Marine Resources Research Department, KORDI) ;
  • Choi, Kwang-Sik (School of Applied Marine Science, College of Ocean Science, Cheju National University)
  • 강도형 (제주대학교 해양과학부) ;
  • 박흥식 (한국해양연구원 해양환경연구본부) ;
  • 이순길 (한국해양연구원 해양자원연구본부) ;
  • 최광식 (제주대학교 해양과학부)
  • Published : 2005.09.30
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Abstract

Reproductive condition of the tropical blacklip pearl oyster, Pinctada margaritifera collected during the period July through September 2003 from Chuuk Lagoon, Federated State of Micronesia was investigated using histology. The level of gonad development for each pearl oyster was determined with an average score of five microscopic fields, and the average score was used as the maturity index (ML). All wild pearl oysters collected in July did exhibit fully ripe eggs in their ovaries ($45{\sim}50{\mu}M$ in diameter), indicating that they were ready for spawning. In mid August most wild pearl oysters were in spawning and M1 dropped dramatically from mid- to late September, suggesting that the wild pearl oyster completed spawning during this period. In contrast, the cultivated pearl oysters collected in mid-September held ripe eggs in the ovaries and only a few of them spawned, indicating that gonad maturation of the cultivated pearl oyster was somewhat slower than that of the wild pearl oyster in Chuuk Lagoon during the summer period. Histological analysis also indicated that spawning of the pearl oyster is rather incomplete and they may spawn continuously during summer.

Keywords

References

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